WO2009027726A1 - Capteur - Google Patents

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Publication number
WO2009027726A1
WO2009027726A1 PCT/GB2008/050699 GB2008050699W WO2009027726A1 WO 2009027726 A1 WO2009027726 A1 WO 2009027726A1 GB 2008050699 W GB2008050699 W GB 2008050699W WO 2009027726 A1 WO2009027726 A1 WO 2009027726A1
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
reagent
sample
analyte
labelled
Prior art date
Application number
PCT/GB2008/050699
Other languages
English (en)
Inventor
Timothy Joseph Nicholas Carter
Steven Andrew Ross
Original Assignee
Vivacta Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vivacta Limited filed Critical Vivacta Limited
Priority to CA2695213A priority Critical patent/CA2695213C/fr
Priority to EP08788670.1A priority patent/EP2185932B1/fr
Priority to JP2010522454A priority patent/JP5749010B2/ja
Priority to CN2008801046876A priority patent/CN101815942B/zh
Priority to ES08788670T priority patent/ES2530673T3/es
Priority to US12/675,684 priority patent/US8524504B2/en
Publication of WO2009027726A1 publication Critical patent/WO2009027726A1/fr
Priority to US13/954,582 priority patent/US9638691B2/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/5302—Apparatus specially adapted for immunological test procedures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/171—Systems in which incident light is modified in accordance with the properties of the material investigated with calorimetric detection, e.g. with thermal lens detection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54366—Apparatus specially adapted for solid-phase testing
    • G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
    • G01N2021/1708—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids with piezotransducers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/062—LED's

Definitions

  • the present invention relates to a sensor and in particular to a sensor and a method for using a sensor to perform a binding assay.
  • a binding assay such as an immunoassay
  • analyte frequently a protein or hapten
  • a binding moiety such as an antibody
  • the binding between the analyte and the antibody is specific, minimising interactions with related but non-identical species, and strong, giving good sensitivity.
  • a characteristic marker e.g. a fluorescent or chemiluminescent molecule
  • a second antibody similarly labelled
  • the labelled species, present in excess, will then bind to the analyte ultimately reaching an equilibrium in which the majority of the analyte is associated with at least one label. Since the concentration of label is fixed, in order to quantitate the analyte, that part associated with the analyte (the "bound" fraction) must be physically separated from that unassociated (the "free' " fraction). Either fraction can then be quantitated, the '"bound” being directly proportional and the "free” being inversely proportional to the concentration of the analyte.
  • the separation of "bound” and “free” fractions is accomplished by using a second antibody (the “capture” antibody), directed against a different epitope on the analyte, bound to a solid phase such as a bead or solid surface.
  • a solid phase such as a bead or solid surface.
  • This bead or solid surface can then be physically separated from the bulk solution and the measurement carried out, for example, using a fluorimeter if the label is a fluorescent molecule.
  • binding interactions in addition to antibody/antigen interactions can be utilised in binding assays, including but not limited to DNA/DNA, RNA/RNA and aptamer interactions.
  • a unique way of distinguishing between the "bound" labelled fraction and the "free” labelled fraction without having to perform separation and washing steps is that described in WO 2004/090512, in which the solid-phase incorporating the capture antibody is a piezo- or pyroelectric film, typically PVDF. This has the unique ability to combine the solid-phase separation feature together with the measurement technique.
  • the labelled "reporter” antibody labelled with a suitable coloured material such as carbon or colloidal gold
  • Light energy is absorbed by the label on the surface and transferred by non- radiative decay as heat, detected by the PVDF film.
  • a simultaneous benefit of this system is that energy similarly absorbed by unbound label in the bulk solution is lost into the liquid medium without being detected by the PVDF film thus automatically effecting a "separation" between the "bound” and “free” fractions. It is advantageous to use a colloidal particle of sufficient size to allow a significant number of photons to be absorbed by the particle to give a strong signal and hence good sensitivity.
  • the sensor described in WO 2004/090512 is used to monitor in real time the kinetics of binding of the label to the capture surface, which is proportional to the concentration of the analyte. This method is dependent on the rate of diffusion of the labelled species to the surface and the rate of binding at the surface. If either of these rates is sub-optimal, the overall sensitivity or the reaction time of the assay may be limited.
  • the rate of binding at the surface can be limited by a number of factors, such as steric hindrance between the labelled antibody (for example if a large carbon or gold particle is used as the label).
  • colloidal gold particle is around 40 nm, because larger particles tend to get trapped in the flow membrane due to their size and density. Finally, larger particles have lower diffusion rates and thus take longer to diffuse to the capture surface, thus possibly limiting available signal.
  • the present invention provides a method for detecting an analyte in a sample, comprising the steps of: exposing the sample to a transducer which is capable of transducing a change in energy to an electrical signal, the transducer having at least one tethered reagent on or proximal thereto, the at least one tethered reagent having a binding site which is capable of binding the analyte; introducing a labelled reagent into the sample, wherein the labelled reagent contains a binding site for the analyte or the tethered reagent and a label which is capable of absorbing electromagnetic radiation generated by a radiation source to generate energy; allowing the labelled reagent to bind to the analyte or tethered reagent in a first period in which the transducer is oriented such that the labelled reagent is caused to settle, at least in part, on the transducer; subsequently, in a second period, causing the labelled
  • Fig. 1 shows a device according to WO 2004/090512
  • FIG. 2 shows a schematic representation of the method of the present invention
  • Fig. 3 shows a device according to the present invention
  • Fig. 4 shows a graph of counts against time, using the method of the present invention.
  • any labelled "reporter" not bound to the surface by specific interaction falls away.
  • the label in close proximity to the transducer will generate a strong signal when appropriately irradiated whilst label distal to the surface generates a weak or negligible signal.
  • all of the label can be concentrated near the binding surface, thus increasing the rate of particles binding to the surface.
  • driving the particles to the surface under the force of gravity or buoyancy can aid in overcoming any electrostatic repulsion force at the surface if the particle and the surface are of like charge.
  • Fig. 1 reproduced herein corresponds to Fig. 1 in WO 2004/090512.
  • Fig. 1 shows a chemical sensing device 1 of the type used with the present invention.
  • the device 1 relies on heat generation in a substance 2 on irradiation of the substance 2 with electromagnetic radiation.
  • the substance 2 used in the present invention is actually a labelled reagent on or proximal to the transducer 3 which is discussed in more detail hereinbelow.
  • the device 1 comprises a transducer, such as a pyroelectric or piezoelectric transducer 3 having electrode coatings 4,5.
  • a substance 2 is held on or proximal to the transducer 3 using any suitable technique.
  • the substance may be in any suitable form and a plurality of substances may be deposited.
  • the substance 2 is adsorbed on to the transducer and in particular the upper electrode, e.g. covalently coupled or bound via intermolecular forces such as ionic bonds, hydrogen bonding or van der Waal's forces.
  • the substance 2 generates heat when irradiated by a source of electromagnetic radiation 6, such as light, preferably visible light.
  • the light source may be, for example, an LED.
  • the light source 6 illuminates the substance 2 with light of the appropriate wavelength (e.g. a complementary colour).
  • the substance 2 absorbs the light to generate an excited state which then undergoes non- radiative decay thereby generating energy, indicated by the curved lines in Fig. 1.
  • This energy is primarily in the form of heat (i.e. thermal motion in the environment) although other forms of energy, e.g. a shock wave, may also be generated.
  • the energy is, however, detected by the transducer and converted into an electrical signal.
  • the signal from the transducer 3 will depend on the distance of substance 2 from the transducer 3, and the time delay between the light pulse and the signal can give beneficial information on that distance.
  • the device of the present invention is calibrated for the particular substance being measured and hence the precise form of the energy generated does not need to be determined. Unless otherwise specified the term "heat” is used herein to mean the energy generated by non-radiative decay.
  • the light source 6 is positioned so as to illuminate the substance 2.
  • the light source 6 is positioned below the transducer 3 and electrodes 4,5 and the substance 2 is illuminated through the transducer 3 and electrodes 4,5.
  • the light source may be an internal light source within the transducer in which the light source is a guided wave system.
  • the wave guide may be the transducer itself or the wave guide may be an additional layer attached to the transducer.
  • the sample to be analysed is exposed to a transducer 3.
  • the transducer 3 is capable of transducing a change in energy to an electrical signal.
  • the energy generated by the substance 2 is detected by the transducer 3 and converted into an electrical signal.
  • the electrical signal is detected by a detector 7.
  • the light source 6 and the detector 7 are both under the control of the controller 8.
  • the light source 6 preferably generates a series of pulses of light (the term "light” used herein means any form of electromagnetic radiation unless a specific wavelength is mentioned) which is termed "chopped light".
  • a single flash of light i.e. one pulse of electromagnetic radiation, would suffice to generate a signal from the transducer 3.
  • a plurality of flashes of light are used which in practice requires chopped light.
  • the frequency at which the pulses of electromagnetic radiation are applied may be varied.
  • the time delay between the pulses must be sufficient for the time delay between each pulse and the generation of an electrical signal to be determined.
  • the time delay between each pulse must not be so large that the period taken to record the data becomes unreasonably extended.
  • the frequency of the pulses is at least 2 Hz, more preferably from 2-50 Hz, more preferably 5-15 Hz and most preferably 10 Hz. This corresponds to a time delay between pulses of at most 500 ms, 20-500 ms, 66-200 ms and 100 ms, respectively.
  • the time delay may be as low as 1 ms.
  • the so-called "mark-space" ratio i.e.
  • the ratio of on signal to off signal is preferably one although other ratios may be used without deleterious effect.
  • Sources of electromagnetic radiation which produce chopped light with different frequencies of chopping or different mark-space ratios are known in the art.
  • the detector 7 determines the time delay (or "'correlation delay' " ) between each pulse of light from light source 6 and the corresponding electrical signal detected by detector 7 from transducer 3, This time delay is a function of the distance, d.
  • the time delay is measured from the start of each pulse of light to the point at which a maximum in the electrical signal corresponding to the absorption of heat is detected as by detector 7.
  • substance 2 may be separated from the transducer surface and a signal may still be detected. Moreover, not only is the signal detectable through an intervening medium capable of transmitting energy to the transducer 3, but different distances, d, may be distinguished (this has been termed "depth profiling") and that the intensity of the signal received is proportional to the concentration of the substance 2 at the particular distance, d, from the surface of the transducer 3.
  • the sample is irradiated with a series of pulses of electromagnetic radiation and the method further comprising the step of detecting the time delay between each pulse of electromagnetic radiation from the radiation source and the generation of the electric signal, wherein the time delay between each of the pulses of electromagnetic radiation and the generation of the electric signal corresponds to the position of the label at any of one or more positions at different distances from the surface of the transducer.
  • the method of the present invention may thus be carried out without removing the sample from the transducer.
  • the transducer 3 is incorporated into a sample chamber 9.
  • the transducer 3 has at least one tethered reagent 10 on or proximal thereto which has a binding site which is capable of binding the analyte 1 1.
  • the at least one tethered reagent 10 may be an antibody
  • the analyte 11 may be an antigen
  • the labelled reagent may be a labelled antigen which is also capable of binding to the at least one tethered reagent or a labelled antibody which is also capable of binding to the analyte.
  • the electrical signal detected by the detector is inversely proportional to the presence of the analyte in the sample.
  • the at least one tethered reagent is a first nucleic acid and the analyte is a second nucieic acid and the first and second nucleic acids are complementary.
  • the at least one tethered reagent contains avidin or derivatives thereof and the analyte contains biotin or derivatives thereof, or vice versa. Examples of suitable immunoassays are described in WO 2004/090512.
  • the at least one tethered reagent is adsorbed or covalently bound to the transducer, although other methods for attaching reagents to surfaces are known, which may also be used.
  • a labelled reagent 12 is then introduced into the sample.
  • the labelled reagent 12 contains a binding site for the analyte 11 or the tethered reagent 10 and a label which is capable of absorbing electromagnetic radiation generated by a radiation source to generate energy.
  • the labelled reagent 12 binds to the analyte 11.
  • the transducer is oriented such that gravity acts on the labelled reagent 12 to cause the labelled reagent 12 to settle, at least in part, on the transducer 3.
  • the label therefore needs to have a sufficient density that it will settle in a reasonable timescale. This will depend on the nature of particle, the nature of sample and the time required to perform the assay.
  • the label is preferably selected from a metal (preferably gold) particle, a coloured-polymer particle (e.g. a coloured latex particle), a magnetic particle, a carbon particle and a nanoparticle comprising a non-conducting core material and at least one metal shell layer (see US 6,344,272).
  • any label capable of interacting with electromagnetic radiation to generate heat would be acceptable, providing it absorbs at the appropriate frequency and settles under gravity.
  • the electromagnetic radiation is radio frequency radiation.
  • the label may be enhanced by catalytic deposition of metallic silver using a solution of silver ions and a reducing agent.
  • the gold catalyses/activates the reduction of the silver ions to silver metal and it is the silver metal which absorbs the light.
  • the label is a gold particle.
  • Gold particles are commercially available or may be prepared using known methods (see for example G. Frens, Nature, 241, 20-22 (1973)).
  • the present invention uses a particle having a particle size of 20 tol,000 nm, more preferably 100 to 500 nm.
  • particle size is meant the diameter of the particle at its widest point.
  • the particle has a density of 1.5 to 23 g/mL, more preferably 15-20 g/mL and most preferably 19 g/mL.
  • the particle is a gold particle having the afore-mentioned particle size and density, although other dense materials could be used, such as osmium or iridium. Subsequently, in a second period, the labelled reagent is caused to become unsettled.
  • Unsettling the labelled reagent changes the signal received at the transducer and provides an indication of the amount of labelled reagent which is bound to the tethered reagent.
  • the labelled reagent is preferably caused to become unsettled by inverting or partially inverting the transducer with respect to the sample.
  • partially inverting is meant that the transducer is inclined such that the labelled reagent is caused to move away from the transducer surface.
  • the labelled reagent may be caused to become unsettled by agitating the sample.
  • unsettling the system causes the unbound label to become separated from the transducer.
  • Fig. 2(c) shows the sample chamber 9 after inversion.
  • the sample is irradiated with electromagnetic radiation during the first and second periods to allow a comparison between the two.
  • the energy generated by the label is transduced into an electrical signal which is then detected by the detector and processed in central processing unit.
  • the sample is typically a fluid sample, such as a bodily fluid, e.g. serum, plasma or urine.
  • a fluid sample such as a bodily fluid, e.g. serum, plasma or urine.
  • the transducer is typically part of a sample chamber.
  • the labelled reagent is releasably attached to one of the interior surfaces of the chamber prior to use.
  • releasably attached is meant that the labelled reagent is attached to the surface, e.g. by being dried down on to the surface, but is released when the sample is introduced.
  • the transducer defines the top of the chamber and the labelled reagent is releasably attached to an interior bottom surface of the chamber. This latter arrangement is particularly suitable for taking a baseline measurement. The baseline measurement is taken after the sample and labelled reagent are presented to the transducer, in such a manner that the labelled reagent is remote from the transducer.
  • analyte may bind to the tethered reagent or to the labelled reagent, however the formation of the sandwich at the surface is precluded because the two are distal to each other.
  • analyte in solution may bind to the tethered reagent, filling up binding sites before the labelled reagent is allowed to move to the transducer.
  • the transducer forms the top of a chamber and the labelled reagent is deposited on the bottom of the chamber, the labelled reagent will remain on the bottom of the chamber under the force of gravity.
  • a baseline reading is taken and the chamber is inverted allowing the labelled reagent to settle on the transducer where a measurement can be taken by following the method described herein.
  • the sample is introduced thereby releasing the labelled reagent, a baseline measurement is taken, the chamber is inverted or partially inverted to allow the labelled reagent to settle, at least in part, on the transducer.
  • the chamber is inverted once more, back to its original position. This then allows unbound labelled reagent to sediment away from the surface, leaving the bound fraction to be quantitated.
  • the present invention has been described with reference to a labelled reagent which is more dense than the liquid medium of the sample so that the labelled reagent settles towards the transducer forming the lower surface (the base) of the sample chamber in the first part of the assay and away from the transducer in the second. That is, the labelled reagent is more dense than the sample and gravity acts on the labelled reagent to cause the labelled reagent to settle, at least in part, on the transducer.
  • the labelled reagent may be less dense than the liquid medium of the sample so that the labelled reagent settles towards the transducer forming the upper surface of the sample chamber (the lid) in the first part of the assay and away from the transducer in the second.
  • the labelled reagent floats to the upper part of the sample chamber under the force of buoyancy.
  • the labelled reagent is less dense than the sample and buoyancy acts on the labelled reagent to cause the labelled reagent to settle, at least in part, on the transducer. Whether the labelled reagent settles by sedimentation or by floatation, the labelled reagent will have a different density to the sample.
  • the present invention also provides a device and kit for performing the above-described method.
  • the device may take the form of a hand-held portable reader and a disposable device containing the transducer.
  • the sample is collected in an essentially closed system, mixed with the labelled reagent and placed in a reader that would orient the analytical chamber as appropriate for capture and then allow the excess unbound labelled reagent to fall/float away.
  • a reader that would orient the analytical chamber as appropriate for capture and then allow the excess unbound labelled reagent to fall/float away.
  • this involves a rotating cassette within a stationary reader, although physically turning the reader may also be included.
  • the chamber is sealed or at least the sample is sufficiently constrained to prevent its leaving the chamber during reorientation, for example by surface tension forces inside a capillary channel.
  • the present invention also provides a device for detecting an analyte in a sample comprising a radiation source adapted to generate electromagnetic radiation; a transducer capable of transducing a change in energy to an electrical signal; at least one tethered reagent on or proximal to the transducer, the tethered reagent having a binding site which is capable of binding the analyte; a chamber for holding the sample in fluid contact with transducer, wherein the chamber is adapted to contain the sample on inversion, partial inversion or agitation of the device; and a detector which is capable of detecting the electrical signal generated by the transducer.
  • the transducer is adapted to undergo inversion, partial inversion or agitation with respect to the sample.
  • the sample chamber is sealed to prevent the sample from spilling.
  • the chamber may be sealed with a Hd, or by capillary forces within the sample chamber.
  • the sample chamber is a capillary tube.
  • the sample chamber preferably has a depth of 50-500 ⁇ m, more preferably 100-300 ⁇ m, and a length/width of 1 -10 mm, more preferably 5 mm, by 10-50 mm, more preferably 30 mm.
  • the sample volume is preferably 1-100 ⁇ L, more preferably 10-50 ⁇ L, and most preferably about 30 ⁇ L.
  • the transducer is preferably a pyroelectric or piezoelectric transducer having a pyroelectric or piezoelectric element and electrodes, and the at least one tethered reagent is preferably adsorbed on to the transducer.
  • the present invention also provides a kit comprising the device as described herein and the labelled reagent also as described herein.
  • a sensor 1 is fabricated from a transducer 3 which is composed of a piece of poled piezoelectric polyvinylidene fluoride coated in indium tin oxide and a piece of transparent polycarbonate lidding film 13.
  • the transducer 3 is coated in antibodies directed against thyroid stimulating hormone (TSH) 5 using standard methods known in the art.
  • TSH thyroid stimulating hormone
  • the transducer 3, which has a thickness of approximately 100 microns, and the lidding material 13 are spaced at a distance of approximately 500 microns using a spacer 14 composed of a piece of polyester coated in pressure sensitive adhesive. This creates a larger sample chamber 15 of approx dimensions 30x10x0.5 mm.
  • a second smaller chamber 16 is fabricated of dimensions 10x10x0.5 mm to allow for a control reaction. Provision is made to allow for electrical connections to the top and bottom surfaces of the transducer 3 in order to detect the charge generated.
  • Assays are carried out by filling the larger chamber 15 (through a fill hole 17) with a mixture of buffer containing 200 nm colloidal gold particles coated with antibodies to TSH and also with TSH at a concentration of 5 ng/mL.
  • the control chamber 16 is simultaneously filled with just buffer and gold particles (at identical concentrations) but no TSH.
  • the entry and exit holes are sealed, then the chamber assembly is connected to a test instrument such that the piezofilm 3 is oriented horizontally on the bottom face of the chamber.
  • the piezofilm 3 is then illuminated with chopped LED light sequentially with four LEDs (of wavelength 525 nm), of which three illuminate different areas of the surface of the read chamber and one illuminates the piezofilm surface of the control chamber 16.
  • a voltage is measured across the piezofilm 3 using a lock-in amplifier and analogue to digital (ADC) converter.
  • the ADC signal is plotted over time and is shown in Fig. 4. It can be observed that the ADC signal rises over the first 1200 seconds, which represents the increased thermal stress induced in the piezofilm 3 as the illuminated gold particles sediment to the surface of the film. After 1200 seconds the signals from the control chamber (LED 1) and the measurement chamber (LEDs 2, 3 and 4) are indistinguishable.
  • the chamber is inverted, such that the piezofilm 3 now forms the top or "roof of the chamber ⁇ this corresponds to the position in Fig. 2(c)).
  • the signal in the control chamber LED 1 falls rapidly as the gold particles move away from the surface under the force of gravity.
  • the fall in signal is much less pronounced, because the TSH present in the sample bridges between the antibodies on the gold particles and the antibodies on the surface, causing the gold particles to be bound to the surface of the piezofilm 3.

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  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
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  • Microbiology (AREA)
  • Biotechnology (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
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  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

L'invention concerne un procédé de détection d'analyte dans un échantillon, consistant : à exposer l'échantillon à un transducteur apte à transduire un changement d'énergie dans un signal électrique, le transducteur contenant au moins un réactif attaché sur sa surface ou à proximité de celle-ci, ledit réactif attaché au moins comportant un site de liaison apte à se lier à l'analyte; à introduire un réactif marqué dans l'échantillon, ce réactif marqué contenant un site de liaison pour l'analyte ou le réactif attaché ainsi qu'un marqueur pouvant absorber un rayonnement électromagnétique généré par une source de rayonnement pour générer de l'énergie; à permettre au réactif marqué de se lier à l'analyte ou au réactif attaché lors d'une première période pendant laquelle le transducteur est orienté de sorte à entraîner la sédimentation, au moins partielle, du réactif marqué sur le transducteur; puis, lors d'une deuxième période, à entraîner la dé-sédimentation du réactif marqué; à irradier l'échantillon au moyen d'un rayonnement électromagnétique pendant les première et deuxième périodes, ce qui transduit l'énergie générée dans un signal électrique; et à détecter le signal électrique. L'invention concerne également un dispositif permettant la mise en œuvre de ce procédé.
PCT/GB2008/050699 2007-08-31 2008-08-13 Capteur WO2009027726A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CA2695213A CA2695213C (fr) 2007-08-31 2008-08-13 Capteur dote d'un transducteur servant a detecter un analyte dans un echantillon
EP08788670.1A EP2185932B1 (fr) 2007-08-31 2008-08-13 Capteur
JP2010522454A JP5749010B2 (ja) 2007-08-31 2008-08-13 センサ
CN2008801046876A CN101815942B (zh) 2007-08-31 2008-08-13 传感器
ES08788670T ES2530673T3 (es) 2007-08-31 2008-08-13 Sensor
US12/675,684 US8524504B2 (en) 2007-08-31 2008-08-13 Sensor
US13/954,582 US9638691B2 (en) 2007-08-31 2013-07-30 Sensor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US96930907P 2007-08-31 2007-08-31
GBGB0716968.3A GB0716968D0 (en) 2007-08-31 2007-08-31 Sensor
US60/969,309 2007-08-31
GB0716968.3 2007-08-31

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US20130315783A1 (en) 2013-11-28
EP2185932A1 (fr) 2010-05-19
CA2695213C (fr) 2017-01-10
CN101815942A (zh) 2010-08-25
JP2010538253A (ja) 2010-12-09
CN101815942B (zh) 2013-09-11
ES2530673T3 (es) 2015-03-04
JP5749010B2 (ja) 2015-07-15
CA2695213A1 (fr) 2009-03-05
US8524504B2 (en) 2013-09-03
EP2185932B1 (fr) 2015-01-28
US20100285609A1 (en) 2010-11-11
US9638691B2 (en) 2017-05-02

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